Clamp.



M. s. 0111mm.

, CLAMP; APPLICATION FILED 001.22, 1906. RENEWED APR. 6, 1908.

Patented Oct. 13,1908.

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' ous size and MATTHEW s. cU NEn'orNEW YORK, N. Y.

. (CLAMP.

Application filed October 22, 19 6, semi Nd. 339,893.

To all whom it may concern-.

Be it known that I, MATTHEW S. CUMNER, residing. in the city of GreaterNew York, in the county and State of New York, have invented certain newand useful Improvements in Clamps, of which the following isaspecificat-ion.

My invention in clamps relates to that class employed principally bymachinists, machine tool makers, or the like and is par ticularlyadapted to the securing of articles inthe process of manufacture,whereby they may be more readily positioned and main tained' for machineoperations than by the clamping devices hitherto in vious to myinvention in so present aware. The object of my invention is to providea far as I am at simple and inexpensive clamp which may be readilyadjusted to grip an article, which it is desired to secure, while at thesame time it may have a considerable range in adjust ing-the clampmgmeans for articlesof variform with facility. The features characteristicof my inven ticn wherein T accomplish the object thereof, are depictedby the illustrations in the sheet of drawings hereto attached andforming part of this specification wherein,

Figure l is a side elevational View of one of my improved clampsgripping a cylinder shown in section and illustrating by the dottedposition of the clamping jaw the extreme rangethereof; and Fig. 2 is anend elevational view of a pair of my improved clamps as applied to acylindrical bar when the same is to be carried and secured inahorizontal position on tool for example a drill press, shaper, millingmachine, grinder or the like.

In both views similar characters ofreference designate like partsthroughout, wherein,

A the shankof the clamp has an integrally formed lug A constituting oneof the jaws and the other jaw A is fitted to the upper surface a of theshank Aby tongue and groove connection comprising the'tongue a at thebase of the jaw A and the-groove a in the upper surface a of'the shankA. The shank A is provided with a series of semicircular stops B forengagement with a stud B which is carried by the terminal or a link Bwhich link embraces the jaw A and by virtue of a clamp screw C passingthrough theopposite end of the link and impinging against the relativelyangular faceC of the Specification of Letters Patent.

'tical face vogue and pre-.

"clamp A is forced to be clamped by the angula-rly disposed link thelink B that whenthe latter is forced to engage the in the operationthebed of a machine Patented Oct. 13, 1908. Renewed April 6,' 1908. SerialNo. 425,447.

I jaw A which, in the instance illustrated, is

the hypotenuse of a right angle triangle (formed by respectively thebase and verof the jaw), forces the latter into a binding engagementwith the jaw A or any intervening article which it is desired to clamp.These series of stops which are preferably. formed by drilling the stockand cutting away there-after approximately one half of the drill holes,together with a sufficient portion of the shank to insure clearance ofthe stud B from the semicircular stops B in disengaging the stud B fromthe stops B when adjusting the clamp, are arranged approximately atequal distances and extend along the length of the shank for a distanceequal to a point substantially in 'line with the lug or jaw A and apoint in line with the face of the jaw A when the latter is in aposition toward the other end of the shank A as illustrated by thebroken lines Fig. 1.

In the position illustrated in Fig. 1, the engage the article to Bwhich, by virtue of its terminal stud B being restrained by one of thestops in the shank A while the screw C is forced against the. hypotenuseof the jaw A will force the latter in the direction of the integral jawA and movement of'the jaw A will be permitted within range of the slotZ).

Intermediate of the link B and engaging the slot 7) of the jaw A is astud b rigidly carried by the link B This stud takes a portion of thereaction thrust upon the jaw A as well as the clamp screw C.

he arrangement of the clamping jaw A and its clamping screw C is suchhypotenuse of the jaw A of clamping an article between the jaw A and jawA the jaw A will beforced in the .manner of a Wedge into engagement withthe article to be clamped and by virtue of the angular position of thelink B the jaw A would be substantially held in contact with the shank Airrespective of the strain which it may be subjected to within thelimits of the strength of the clamp, and the jaw A will be maintainedparallel with the jaw A.

It :will be observed by the dotted position Fig. 1, that the stud b? isapproximately in a position with respect to the jaw A which would limitthe movement of the jaw from further clamping, since the contact of thestop pin 6 with the terminal of the slot 6 is the limit of clampingmovement allotted. to the jaw A Thus it will be seen that a limitedmovement of the clamping screw C on the hypotenuse of the jaw A isprovided; and thus the tendency for restricting the jaw A to a parallelstrain rather than an oscillating movement, is obviously more effectivethan were the clamping screw C in either of the extreme positions.

The plurality of stops B provide a considerable range in the adjustmentof the clamp while the slot 7) in the jaw being parallelly disposed withthe face of the shank or the foot of the aw A provides a limiting rangeof movement for any individual stop B.

It will be observed by the foregoing description that my novel parallelclamp provides a convenient and readily adjustable means for securingsmall articles while positioning them on the bed of a drill press orother tool as aforesaid, and serves the purpose in general of the usualmeans for strapping which is somewhat troublesome when pieces of workare required to be held sub stantially parallel with the bed of thepress or other tool.

The clamp as illustrated shows the shank A as the base but it is obviousthat the integral jaw A may serve as well for the base in which case apiece which is drilled or operated upon in the position illustrated maybe subjected to a further operation at degrees from the first by turningthe clamp together with the piece into a position 90 degrees from theformer and in a manner whereby the integral aw A will be the base inlieu of the shank A.

I am aware that prior to my invention, clamps having parallel jawsadapted to rapid adjustment have been in vogue, and I therefore do notclaim these broadly as my invention, and having fully described myinvention, I do claim, however, and desire to secure by Letters Patentof the United States 1. In a clamp, the combination with a shank, and anintegral clamping jaw, of an adjustable jaw, and a clamp co-actingbetween the shank and the adjustable jaw, and an adjustable pivotalconnection beti een the said latter clamp and the adjustable jaw.

2-. In a clamp, the combination with a shank, and an integral clampingjaw, said shank having a longitudinally slotted portion, provided withseries of stops, of an adjustable jaw, having a slotted portion, and aclamp co-acting between the slotted portion of the shank and theadjustable aw, and the slotted portion of the adjustable jaw beingpivotally connected to the co-acting clamp.

In a clamp, the combination with a reetangnlar shank, and an integralclamping jaw, having its outer extremity substantially perpendicular tothe shank, said shank having a longitudinally slotted portion, providedwith a series of stops, of an adjustable jaw, adapt ed to slide upon theshank, having a slotted portion and a clamp co-arting between the stopsin the slotted portion of the shank and the slotted portion of the a w,and a clamping screw arried by the latter said clamp adapted to engagethe adjustable jaw.

st. In a clamp, the combination with a rectangular shank, and anintegral rectangular jaw, perpendicularly situated with respect to theshank, said shank having a longitiulinally slotted portion provided withaseries of stops, of an adjustable jaw slidingly mounted on the shank,having a perpendieit lar securing face and an angular clamping face anda longitudinal perforation between the two said faces, and a clampco-act ing between the stops, in the slotted portion of the shan and theslotted portion of the jaw and a clamping screw :arried by the hilt ersaid clamp adapted to engage the angular clamping face of the adjustableaw.

In a clamp, the combination with a. reetangular shank, and an integralrectangular jaw, having a free rectangular terminal perpendicularlysituated with respect to the shank, said shank having a longitudinallyserrated portion, of an adjustable jaw slidingly mounted on the shank,having a perpendicular securing face and a rectangular free terminallying in the same plane with the rectangular terminal of the integraljaw and an angular clamping face, and a longitudinal perforation betweenthe two said faces and of a clamp co-acting between the serrated stopsin the slotted portion of the shank, and the slotted portion of the jawand a clamping screw carried by the latter said clamp adapted to engagethe angular clamping face of the adjustable aw.

In testimony whereof, I have hereunto signed my name to thisspecification in. the presence of two subscribing witnesses.

MATTHEIV S. CUMNER.

Witnesses PIIILTP II. STERN, J. IVALmon Can'rnn.

